Carburetor



1 1.. H. MESSINGER. JR 2,021,695

CARBURETOR Filed April 16, 1954 (i I Z6 9 IN V EN TOR.

Lea/e H Masai/199m A TTORNEY v Patented Nov. 19, 1935 PATENT OFFICE CARBURETOR Lester H. Messinger, Jr., Trumbull, Oonn., as-

signor to Messinger Devices, Incorporated, Bridgeport, Cnn., a corporation of Connecticut Application April 16, 1934, Serial No. 720,757

8 Claims.

This invention relates to new and useful improvements in carburetors.

The invention includes means whereby the. gasoline sprayed from an accelerating pump of a carburetor, when the pump discharges on failure of vacuum for reasons other than the opening of the carburetor throttle valve, is saved and maintained in position to be drawn into the engine fed by the carburetor, on the throttle of the carburetor being advanced to accelerate the engine.

The objects and advantages of the invention will become more apparent from a consideration of the following detailed description taken in connection with the accompanying drawing wherein a satisfactory embodiment of the invention is shown. However, it is to be understood that the invention is not limited to the details disclosed but includes all such variations and modifications as fall within the spirit of the invention and the scope of the appended claims.

In the drawing:

Fig. 1 is a sectional view through a carburetor illustrating an embodiment of the invention; and

Fig. 2 is a detail sectional view illustrating a slight modification. I

In the drawing the means of the present invention is shown as incorporated in a carburetor of well known make including a body containing a gasoline chamber 6, an air inlet 1, and a riser portion 8 to be connected with a manifold of an engine. The carburetor disclosed also includes the usual vent tube la extending into the air inlet 1 and at its upper end communicating through the usual passage 6a with the upper portion of the float chamber 6 to vent the latter. A gasket 50, is arranged between the edges of the top and bottom portions of the carburetor. Gasoline is supplied to the carburetor through an inlet 9 and the height of the gasoline in the chamber 6 is controlled by a valve It which in turn is controlled by a float I in said chamber. Through a metering jet |2 gasoline from chamber 6 is admitted to a passage l3 from which it enters the main discharge jet I4 of the carburetor and from the discharge end I5 of which it is taken up by air drawn into an engine through large and small venturis I6 and H, when the throttle valve I8 is open. Associated with the main discharge jet I4 is the usual high speed bleed jet or tube Ma.

Carburetor 5 is also provided with the usual idle or supply tube |9a to the idle discharge opening l9 and with a plug 29 forsai'd discharge, this being a usual construction. A vacuum accelerator pump, forming part of the carburetor, is generally designated 2| and includes a vacuum piston 22 communicating with the passage 8 above the throttle valve l8 as through a port or passage 23.

An accelerator pump piston 24 is connected to the end of the rod 25 opposite the vacuum pis- 5 ton 2.2 and a coil spring 26 surrounds said rod. When a high degree of vacuum is created in the passage 8 it is communicated to the vacuum piston 22 through the passage 23 and draws the same upwardly resulting in the pump piston 24 also being drawn upwardly to suck gasoline into the pump from the chamber 6 and compress the spring 26.

On the degree of vacuum in passage 8 being materially reduced the spring 26 acts or expands to cause the vacuum accelerator pump to discharge and the latter discharges through a passage 21 and into the main discharge jet M at 28. This gasoline discharged by the vacuum accelerator pump is sprayed from the end l5 of the main discharge jet and when there is no vacuum in the venturis about said end the gasoline drops onto the lower wall 29 of the body 5. Ordinarily this wall is simply provided with an opening through which such gasoline may pass out onto the floor or ground beneath the car.

Ordinarily, when a car equipped with this carburetor is operating with open throttle there is no appreciable vacuum in the passage 8 or through the passage 23 and the accelerator pump 30 2| is in discharged position. When the throttle is closed while the engine is operating as when the engine is idling or is being driven by the vehicle there is a high degree of vacuum imposed on the piston 22 and the pumppiston 24 is drawn upwardly bringing about a compressing of the spring 26 and a charging or loading of the pump. Now, on the throttle valve l8 being advanced the vacuum through the passage 23 or on the vacuum piston 22 of the pump 2| is destroyed and the spring 26 expands causing the pump to discharge. Since the throttle valve has been opened the gasoline sprayed from the discharge end l5 of the main discharge jet I4 will be taken up by air being drawn through the venturis i6 and I1.

From the above it will be understood that each time a high degree of vacuum is created through the passage 23 the pump 2| is loaded with gasoline and that each time such vacuum is destroyed the pump discharges the gasoline through the jet I4. When the destruction of the vacuum results from the opening of the throttle valve l8 while the engine is operating the gasoline thus sprayed by the pump is immediately drawn into the engine to accelerate the same or give it an extra charge and this is the purpose of the pump 2|.

However, when the pump is charged or loaded and the vacuum is destroyed as by cutting off the ignition of the engine to park an automobile equipped with the carburetor the pump discharges in the customary manner and since air is not being drawn through the venturis to pick up the gasoline so sprayed such gasoline falls onto the the wall 23 of the carburetor and passes out through an opening provided therein as above indicated. This same loss of gasoline results when the vacuum in the carburetor riser portion 8 and in the intake manifold of an engine is destroyed by the opening of a valve of the type disclosed in my Patent 1,916,356 of May 23, 1933, while the engine is being driven by the vehicle With the throttle valve !3 closed.

The present invention provides means whereby the gasoline discharged by the pump 2! when the throttle valve i8 is closed, and which gasoline is not now carried into the engine for consumption, is saved and is fed to the engine on the throttle valve i 8 being opened to accelerate the engine. To accomplish the desired purpose the opening normally provided in the carburetor wall 29 for the escape of gasoline as above described is enlarged when it is not the required diameter and is then tapped whereby to provide an internally threaded opening 33.

A receptacle 3i having an externally threaded entrance or neck-like portion 32 is threaded into the opening 33 whereby all gasoline passing downwardly through said opening 33 will enter andbe retained by said receptacle. A tube 33 extends out of the receptacle 3 i upwardly through the opening 39 and preferably terminates at or adjacent the portion of the venturi where the greatest degree of suction is available when the throttle valve i3 is opened and air is being drawn through the carburetor to an engine. This tube 33 is of less diameter than the entrance opening through the neck-like portion 32 of the receptacle whereby not to close such opening but to leave sufiicient space for the entrance of gasoline into the receptacle 3! through such opening. Tube 33 may be of copper or similer soft nonferrous metal whereby it may be bent to locate its upper end at the desired point and whereby it will not be quickly destroyed by the action of the gasoline.

The tube 33 may be mounted by the receptacle 3.! in any desired manner but as here shown the receptacle is provided with an opening in its lower wall and with a skirt-like portion 34 depending from such wall and surrounding said opening. The end of tube 33 passes into such portion 34 and a nut 35 threaded therein has a conical portion 36 entering and spreading the lower end of the tube to clamp the same against the receptacle and this conical nut portion 35 also closes the lower end of the tube. One or more openings 3'! in the tube adjacent the lower wall of the receptacle 3! provides for the entrance of gasoline into the tube from the receptacle.

Fig. 2 suggests a slight modification wherein the upper outlet or discharge end of a tube 38,

corresponding with the tube 33 of Fig. l, is located within the small venturi H. The upper end of tube 38 is preferably located at that point in the venturi at which the greatest suction is available when the throttle valve i3 is open and an engine equipped with the carburetor is in operation.

With the means described any time the vacuum accelerator pump discharges and the gasoline discharged by the pump is not carried into the engine the said gasoline will fall and find its way into the receptacle 3|. There it Will be saved and will enter into the tube 33 through the opening or openings 3?. Since the discharge end of said tube or of the tube 38 is located at a point where there is the greatest rush of air when the throttle valve i8 is open the gasoline in the receptacle and in the tube wiil be drawn from the receptacle and tube, through the latter, and into the engine when the throttle valve is next opened and the engine is operating.

Therefore, it will be seen that when a valve of the type disclosed in my patent above referred to opens while an engine is being driven by a vehicle with the throttle valve of the carburetor closed, the gasoline discharged by the pump will enter the receptacle 3| and be available through the tube 33 or 38, or both if desired, when the vehicle operator again opens the throttle valve to accelerate the engine. It is also to be understood that the present means while here disclosed as an attachment for existing carburetors may be built into a carburetor at the factory. Further, it should be clear that the invention is applicable to carburetors other than that shown in the drawing.

Having thus set forth the nature of my invention, what I claim is:

i. In combination, a carburetor including a gasoline chamber, a venturi, a throttle valve, a nozzle for supplying gasoline from said chamber to said venturi, a pump communicating with said gasoline chamber and including vacuum operated means to move it toward loaded position and spring means to operate it to discharge gasoline through said nozzle on reduction of vacuum on said means, means collecting the gasoline so discharged by the pump while the throttle valve is closed, and means providing a passage communicating said last means with said venturi whereby the gasoline so collected will not be drawn into an engine fed by said carburetor except on opening of said throttle valve while there is a suction in the engine.

2. In combination, a carburetor including a gasoline chamber, a venturi, a throttle valve, a nozzle for supplying gasoline from said chamber to said venturi, a pump communicating with said gasoline chamber and including vacuum operated means to move it toward loaded position and spring means to operate it to discharge gasoline through said nozzle on reduction of vacuum on said means, said carburetor including an air intake having a lower wall receiving the gasoline so discharged while the throttle valve is closed, said wall having an opening therethrough, a receptacle receiving gasoline passing through said opening, and a tube extending between the interior of said receptacle and said venturi and through which gasoline may be drawn from the receptacle into an engine fed by the carburetor only while the throttle valve is open and. there is a suction in the engine. V

3. In combination, a carburetor including a gasoline chamber, a venturi, a throttle valve, a nozzle for supplying gasoline from said chamber to said venturi, a pump communicating with said gasoline chamber and including vacuum operated means to move it toward loaded position and spring means to operate it to discharge gasoline through said nozzle on reduction of vacuum on said means, said carburetor including an air intake having a lower wall receiving the gasoline so discharged while the throttle valve is closed, said wall having a threaded opening therethrough, a receptacle having an inlet threaded to said opening and receiving gasoline passing therethrough, and a tube extending between the interior of said receptacle and said venturi and through which gasoline may be drawn from the receptacle into an engine fed by the carburetor only while the throttle valve is open and there is a suction in the engine.

4. A carburetor attachment for the purpose described, the same comprising a receptacle having an entrance portion, a tube extending freely through said portion, said tube extending through the bottom wall of the receptacle, means on the receptacle and securing the tube thereto and closing the receptacle end of the tube, and said tube having an inlet opening adjacent the bottom wall of the receptacle.

5. A carburetor attachment for the purpose described, the same comprising a receptacle having an entrance portion, a tube extending freely through said portion, said tube extending through the bottom wall of the receptacle, a nut threaded on the receptacle and securing the tube thereto and closing the receptacle end of the tube, and said tube having an inlet opening adjacent the bottom wall of the receptacle.

6. In combination, a carburetor including a gasoline chamber, a venturi, a throttle valve, a nozzle for supplying gasoline from said chamber to said venturi, a pump communicating with said gasoline chamber and including vacuum operated means to move it toward loaded position and spring means to operate it to discharge gasoline through said nozzle on reduction of vacuum on said means, means collecting the gasoline so dismeans to move it toward loaded position and spring means to operate it to discharge gasoline through said nozzle on reduction of vacuum on said means, means collecting the gasoline so discharged by the pump while the throttle valve is closed, and means for introducing the gasoline so collected into the air stream of the carbureter only while said throttle valve is open and there is suction in an engine fed by the carburetor.

8. In combination, a carburetor including a gasoline chamber, a throttle valve, a nozzle for supplying gasoline from said chamber, a pump communicating with said gasoline chamber and including vacuum operated means to move it toward loaded position and spring means to operate it to discharge gasoline through said nozzle on reduction of vacuum on said means, means collecting the gasoline so discharged by the pump While the throttle valve is closed, and means whereby the gasoline so collected will be supplied to an engine fed by said carburetor only while said throttle valve is open and there is a suction in the engine.

LESTER H. MESSINGER, JR. 

